Minor changes to java.io - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

Minor changes to `java.io`

Minor changes to this package are:

The out field of the PrintWriter class is now protected rather than private, so that subclasses may access it
The RandomAccessFile class supports a new setLength method; and
The StringWriter(int) constructor is now public.

The following constructors now check for null input parameters:

The constructors PrintStream(OutputStream out) and PrintStream(OutputStream out, boolean autoFlush) will throw a NullPointerException if the parameter out is null.
The constructors InputStreamReader(InputStream in) and InputStreamReader(InputStream in, String enc) will throw a NullPointerException if the in parameter is null.
The constructors OutputStreamWriter(OutputStream out) and OutputStreamWriter(OutputStream out, String enc) will throw a NullPointerException if the out parameter is null.
The protected constructors Reader(Object lock) and Writer(Object lock) now throw NullPointerException if the lock parameter is null.

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